Re: Issue with functions in Rule - Mailing list pgsql-general

Hakan Kocaman wrote:
> Hello Folks,
>
> first i want to apologize for my bad english :~)
> we got here apparntly 2 issues with the above mentioned functionality:
>
> 1.    I want to use functions with composite types as parameters,
>     which is no deal on our current production server(postgres 7.4.3)
>     but don't work on our upcoming production server(8.0.3).
>     A sample function is attached.
>     The function uses a composite type from a view, which declaration
>     is alos attached.
>     In this thread it is mentioned as a bug:
>     http://archives.postgresql.org/pgsql-admin/2005-08/msg00153.php
>     The question is if it's fixed in 8.0.4 or 8.1.
>
> 2.     Using the mentioned function in a rule on the mentioned view
>     clashs on the fact, that we don't find a appropriate way for the syntax.
>     The rule is also attached.

CREATE OR REPLACE RULE update_produkte AS
     ON UPDATE TO viewprodukte DO INSTEAD
SELECT fu_upd_viewprodukte(vp1.*, vp2.*) AS fu_upd_viewprodukte
FROM viewprodukte vp1, viewprodukte vp2
WHERE vp1.id = new.id AND vp2.id = old.id;

Well, as a short-term workaround, surely you could rewrite this to take
(new.id,old.id) as parameters instead?

I also can't reproduce your problem in 8.0.3 on my Debian-based system
here. I've attached my test-script - am I missing something?

--
   Richard Huxton
   Archonet Ltd

CREATE TABLE test_table (a int4, b text);
COPY test_table FROM stdin;
1    aaa
2    bbb
3    ccc
4    ddd
\.

CREATE VIEW test_view AS SELECT a,b FROM test_table WHERE (a % 2) = 1;


CREATE OR REPLACE FUNCTION test_upd_fn(test_view, test_view) RETURNS boolean AS $$
BEGIN
    RAISE NOTICE 'test_upd_fn(a1=%, b1=%, a2=%, b2=%)', $1.a,$1.b, $2.a,$2.b;
    UPDATE test_table SET b=b || 'x' WHERE a=$1.a;
    RETURN true;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE RULE my_upd_rule AS ON UPDATE TO test_view
DO INSTEAD
SELECT test_upd_fn(v1.*, v2.*) FROM test_view v1, test_view v2 WHERE v1.a=NEW.a AND v2.a=OLD.a;


SELECT * FROM test_table;
SELECT * FROM test_view;

UPDATE test_view SET b='ccc2' WHERE a=3;

SELECT * FROM test_view;